Internal-combustion engine working with coke-oven and other gases.



0. CLERK. INTERNAL COMBUSTION ENGINE WORKING WITH COKE OVEN AND OTHERGASES. APPLICATION FILED IAN-31.19M-

LIJQD Patented Oct.26,1915.

2 SHEETSSHEET I.

a II I i g ,cm k" &

m I n MI q D. CLERK. INTERNAL COMBUSTION ENGINE WORKING WITH COKE OVENAND OTHER GASES. APPLICATION FILED JAN. 31, ms.

Patented Oct. 26,1915.

2 SHEETSSHEET 2.

AWCRNEY IDUGALID CLERK, OF LONDON, ENGLAND, ASSIGNOR TO THE NATIONAL GASENGINE COMPANY LIMITED, F ?SHTON-UNDER-LYNE, ENGLAND.

INTERNAL-COMBUSTION. ENGINE WORKING WITH COKE-OVEN AND OTHER GASES.

Specification of Letters Patent.

Patented Uct. ac, was.

Application filed January 31, 1913. Serial No. 745,483.

' ject of the King of Great Britain and Ireland. and residing at 58Lincolns Inn Fields, London, \V. (3., England, have invented certain newand useful Improvements in Internal-Combustion Engines \Vorking withCoke-Oven and other Gases, of which the following is a specification.

Internal combustion engines using cokeoven gas are liable to frequentpre-ignitions, due to the high hydrogen contents of the gas.

The object of this invention is to avoid pre-ignitions in such engineswhen using coke-oven or other gas or vapor containing a high percentageof hydrogen.

The invention consists in introducing cooled exhaust gases to the chargeinlet pipe so that the oxygen contents of the entering air charge arereduced, and the nitrogen and carbonic acid contents increased. It ,Ihas been found by experiment that by this means pre-ignitions can beentirely avoided without in any way reducing the power developed by theengine. I

In carrying the invention into efl'ect according to one modification,the exhaust gases are cooled by passing through a sufficient length ofpipe into a chamber. The pipe and chamber may be either water or aircooled. The pressure in this chamber may be maintained by the dischargefrom the engine very slightly above atmosphere, and a pipe from thechamber is conducted to the air inlet aperture of the engine. Cooledexhaust gases containing but little oxygen, and consisting mostly ofnitrogen and carbonic acid, then pass into the air inlet at atmos hericpressure, and there mix with the an charge entering the engine.

According to another modification of the apparatus, cooled exhaust gasfrom an existing silencer or exhaust pit is carried to the air inlet bya pipe, and there taken into the engine cylinder.

Referring to the accompanying drawings,

Figure 1 shows one form of the invention, as applied to a six-cylindervertical tandem engine, and in which cooling of the exhaust gases isefi'ected by an exposed pipe of considerable length. Fig. 2 is a plan ofFig. 1, with the engine omitted. Fig. 3 illustrates a modification inwhich a water cooled chamber is employed to cool the exhaust gases: inthis figure the complete engine is not shown. Fig. 4 is a plan of Fig.3. Fig. 5' illustrates the application of a cooled chamber to the caseof a horizontal gas engine. 7

In carrying the invention into effect according to one form, and asillustrated in Figs. 1 and 2, as applied to a six-cylinder verticaltandem gas engine, the exhaust gases are led from the engine a by wayofpipes b and c to the exhaust silencers d and c, which are connected inseries by the pipe f, the gases finally escaping by the upcast pipe 9.The exhaust silencers are situated without the building in which theengine is housed: 00 represents the wall of the building. Gas and airare led to the mixing box it upon the engine by way of pipes j and 70respectively, the air pipe 70 being provided with a suitable protectingrose Z. The conduits j and is are controlled by a suitable regulatingvalve, for instance, m, and a governor valve 11.. From the bottom of thesecond silencing chamber 6 a pipe 0 leads to a suitable point in theinlet pipe is. This pipe 0 is of considerable length, in order topresent a large cooling surface to the surroundcock 9 are provided inthe pipe 0. The dimension of the pipe 0 and the adjustment of the cock 2are such relatively to the dimensions of the air inlet pipe 70 that theproportion of exhaust gas in the air charge is about 10 per cent.,although in some cases, in dealing with certain classes of gas, it isnecessary to increase theproportion to 15 or 20 per cent.

In carrying the invention into efi'ect, according to a secondmodification, and as illustrated in Figs. 3 and 4, a chamber 1' which ispreferably water cooled, is included in the circuit of the exhaust gasespassing from the silencer e to the air pipe 70. Suitable water inletsand outlets s and tmay be provided upon the chamber 7*, and a drain cock(I is provided for the draining away of water condensed from the exhaustgases.

In a further modification illustrated in Fig. 5, the invention is shownappliedto a normal single cylinder gas engine of the horizontal type. Inthis arrangement, the

exhaust gases are led 'b the pipe I) to a silencer d. From the silencerd a pipe it leads to a chamber 1", which may be water cooled. From thechamber 1' a pipe '0 leads to the air inlet pipe 70. A suitable airsuction silencer w may be applied to the end of the pipe 70. The otherend of the pipe 70 leads to the air controlling cock y. The action ofthis modification is similar to the action of the first described form.

It is to'be noted that the cooled exhaust products are introduced atsuch a point in the air inlet pipe as will insure that in passingthrough the inlet valve of the engine, the exhaust products shall bethoroughly mixed with the air and gas constituting the remainder of'thecharge. This is essential in order that the oxygen content shall beuniformly reduced throughout the body of the charge in the enginecylinder.

Claim.

A method of working internal combustion engines, which consists intrapping a portion of the engine exhaust gases, passing these gasesthrough a cooling device, drawing these cooled gases into the enginecylinder, together with air and combustible gas, compressing the mixtureand igniting the charge, as and for the purposes described.

In testimony whereof, I aflix my signature in presence of two witnesses.

DUGALD CLERK.

Witnesses:

BERTRAM H. MATTHEWS, J. PHILLIPS HAWLEY.

